Select a correct match:

Options

A. Didynamous stamen-Cassia
B. Tetradynamous stamen-Mustard
C. Epiphyllous condition-China rose
D. Syngenesious condition-Cucumber

Answer

To solve the question of selecting the correct match from the given options, we need to analyze each option based on the definitions and examples of the terms provided. Here’s a step-by-step breakdown of the solution:

### Step-by-Step Solution:

1. **Understanding Didynamous Stamens**:
- Didynamous stamens consist of four stamens in total, where two are long and two are short.
- This type of stamen is not found in the family Cacaceae.
- **Conclusion**: The first option is incorrect.

2. **Understanding Tetradynamous Stamens**:
- Tetradynamous stamens consist of six stamens, where two are short and four are long.
- This type of stamen is characteristic of the mustard plant (Brassica).
- **Conclusion**: The second option is correct.

3. **Understanding Epiphyllous Condition**:
- In the epiphyllous condition, the stamens are attached to the perianth (the outer parts of the flower).
- This condition is not found in China rose (Hibiscus rosa-sinensis).
- **Conclusion**: The third option is incorrect.

4. **Understanding Syngenesious Condition**:
- In the syngenesious condition, the filaments of the stamens are free, but the anthers are fused together to form a compound structure.
- This condition is typically found in plants like sunflowers, not cucumbers.
- **Conclusion**: The fourth option is incorrect.

5. **Final Conclusion**:
- After analyzing all the options, the only correct match is the tetradynamous stamens with mustard.
- Therefore, the correct answer is **Option B**.